Assessment of coverage error for two common commercial dental shade guides using a spectrophotometric method

Tabatabaian, Farhad; Khezri, Amir Saleh; Ourang, Seyed AmirHossein; Namdari, Mahshid

doi:10.1002/col.22725

Cited by 5 publications

(10 citation statements)

References 31 publications

(56 reference statements)

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“…A recent study [ 20 ] assessed the coverage error and the coverage error percentage for VC and V3DM calculated as the color difference between each tooth region of the participant and matched shade of the shade guide. For VC shade guide, the reported coverage error was 3.0 ± 1.2 units and 3.3 ± 1.3 units, while for the V3DM guide, the coverage error was 2.5 ± 1.3 units and 2.9 ± 1.5 units.…”

Section: Discussionmentioning

confidence: 99%

“…Finally, in terms of limitations, the use of a contact spectrophotometer involves inaccuracies due to the “edge loss” phenomenon. Tooth curvature also generates color measurement inaccuracies when using non-contact devices, which can be minimized by repeated measurements but cannot be completely eliminated [ 20 ]. In addition, the results of this study can be extended in future research to other shade guides, populations, and age groups.”…”

Section: Discussionmentioning

confidence: 99%

“…The coverage error of dental shade guides can be calculated from visual ( ) or instrumental ( ) color determinations, having both methods some shortcomings. In determinations, it is difficult to isolate the inherent error of the instrument (color guide ) from the error attributable to the observer’s subjectivity [ 20 ]. On the other hand, when is calculated instrumentally, the shade matching device selects the best shade tab for the target tooth according to its internally stored data set of dental shade guides [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…In determinations, it is difficult to isolate the inherent error of the instrument (color guide ) from the error attributable to the observer’s subjectivity [ 20 ]. On the other hand, when is calculated instrumentally, the shade matching device selects the best shade tab for the target tooth according to its internally stored data set of dental shade guides [ 20 ]. The present study has calculated the of two of the most widely used clinical shade guides, combining visual and instrumental color determination methods, in an attempt to determine the contribution of inherent guide error ( ) to the overall visual error.…”

Section: Introductionmentioning

confidence: 99%

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Visual and instrumental coverage error of two dental shade guides: an in vivo study

et al. 2022

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Objectives This study aims to evaluate in vivo the color agreement between natural teeth and dental shade guides by means of visual and instrumental coverage error ($$\mathrm{CE}$$ CE ) index. Materials and methods The color of the middle third of 735 incisors was visually determined by two evaluators using the Vita Classical (VC) and Vita 3D Master (V3DM) shade guides. The color match between the natural tooth and the shade tab was rated as poor (P), good (G), or optimum (O) by each observer. CIE color coordinates of the target teeth and shade tabs of VC and V3DM were instrumentally measured using a clinical spectrophotometer. Visual ($${\mathrm{CE}}_{\mathrm{V}}$$ CE V ) and instrumental ($${\mathrm{CE}}_{\mathrm{I}}$$ CE I ) coverage error indexes were computed using CIELAB and CIEDE2000 metrics for both shade guides. For $${\mathrm{CE}}_{\mathrm{V}}$$ CE V calculation, only the concordant inter-observer determination on tooth shade rated as O–O or O–G was used. The results were evaluated using perceptibility (PT, $${\mathrm{\Delta E}}_{\mathrm{ab}}^{*}$$ Δ E ab ∗ = 1.2, $${\mathrm{\Delta E}}_{00}$$ Δ E 00 = 0.8) and acceptability (AT, $${\mathrm{\Delta E}}_{\mathrm{ab}}^{*}$$ Δ E ab ∗ = 2.7, $${\mathrm{\Delta E}}_{00}$$ Δ E 00 = 1.8) color thresholds for dentistry. Results VC and V3DM exhibited $${\mathrm{CE}}_{\mathrm{I}}$$ CE I (2.5, 3.2, and 3.2, 2.7 CIELAB units; 1.9, 2.3, and 2.8, 2.4 CIEDE2000 units, respectively, for O–O and O–G match) and $${\mathrm{CE}}_{\mathrm{V}}$$ CE V (4.7, 4.8, and 4.1, 4.6 CIELAB units; 3.3, 3.4, and 3.4, 3.6 CIEDE2000 units, respectively, for O–O and O–G match) values greater than 50:50% AT for both color difference formulas. $${\mathrm{CE}}_{\mathrm{I}}$$ CE I contributes more than 50% (53.2–82.4% range) to the $${\mathrm{CE}}_{\mathrm{V}}$$ CE V value. This contribution depends on the shade guide used and the quality of the visual rating. Conclusions The evaluated shade guides exhibited visual coverage errors above acceptability thresholds, largely due to the contribution of the instrumental coverage error to the visual coverage error. Clinical relevance It necessary to further improve commercially available dental shade guides to facilitate achievement of satisfactory esthetics results in clinical practice.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Visual and instrumental coverage error of two dental shade guides: an in vivo study

et al. 2022

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“…According to the manufacturer, this was achieved through the uniform distribution of its 26 physical shade tabs across the dental color space, taking into account lightness, chroma, and hue. [27][28][29][30][31] However, no 3D visual information is available to confirm this, nor have any studies been published that represent this spatial distribution in visual form. Data from the manufacturer on the color coordinates of the shade tabs are also lacking.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional representation of the Vita Toothguide 3D‐Master: An in vivo clinical study

Gómez‐Polo,

Fraile,

López

et al. 2023

J Esthet Restor Dent

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Statement of ProblemThe Vita Toothguide 3D‐Master (Vita Zahnfabrik) is considered the dental shade guide in which the three dimensions of color – lightness, hue, and chroma – are most well‐ordered in the CIELAB color space. No research has yet explored how well the Vita Toothguide 3D‐Master is ordered in the 3D color space by recording color coordinates in vivo.PurposeTo evaluate the spatial color distribution of the Vita Toothguide 3D‐Master's lightness, chroma, and hue groups and its 26 physical shade tabs.Materials and MethodsThe dental color (L*, C*, h°, a*, and b* color coordinates) of a healthy maxillary central incisor was recorded for 1361 participants (aged between 18 and 89 years) using a Vita Easyshade Compact spectrophotometer (Vita Zahnfabrik). The R 2.7.2. statistics program was used to create the visual representations.ResultsThe five lightness levels are those that are best distributed in the color space, in relation to the L* coordinates, followed by the chroma group and, finally, the hue group. The 5M1, 5M2, and 5M3 physical shade tabs are situated at a greater distance apart from the other tabs in the color space.ConclusionsThe Vita Toothguide 3D‐Master's 26 physical shade tabs are satisfactorily distributed in three‐dimensional space, although strict mathematical criteria are not followed. The natural dental shades that fall lower on the lightness scale are the most poorly represented by the physical shade tabs.Clinical ImplicationsDarker teeth are poorly represented by the Vita Toothguide 3D‐Master's physical shade tabs. The spatial distribution of dental shade guides needs to be improved to ensure they provide homogeneous coverage of the entire chromatic spectrum corresponding to natural teeth. This would help reduce the errors inherent to the subjective visual color selection process.

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Accuracy and precision of intraoral scanners for shade matching: A systematic review

Tabatabaian¹,

Namdari²,

Mahshid³

et al. 2022

The Journal of Prosthetic Dentistry

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Assessment of coverage error for two common commercial dental shade guides using a spectrophotometric method

Cited by 5 publications

References 31 publications

Visual and instrumental coverage error of two dental shade guides: an in vivo study

Visual and instrumental coverage error of two dental shade guides: an in vivo study

Three‐dimensional representation of the Vita Toothguide 3D‐Master: An in vivo clinical study

Accuracy and precision of intraoral scanners for shade matching: A systematic review

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